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Question

Wicket: How to add link address in runtime

Answer 1

+2 A:

ExternalLink takes a model parameter that supplies a link URL. That model can be pretty much anything. Here's one that generates random links (LoadableDetachableModel is a convenience implementation of a dynamic model):

IModel<String> model=new LoadableDetachableModel<String>() {
    private static final long   serialVersionUID    = 1L;
    @Override
    protected String load() {
        // this class does not really exist
        return LinkRandomizer.getNewRandomUrl();
    }
};
add(new ExternalLink("link", model));

See:

It turns out the OP needs a ListView with ExternalLinks.

Here is a Panel with a list of links:

public class FooPanel extends Panel {

    private static final long   serialVersionUID    = 1L;

    public static class LinkBean{
        private String link;
        private String label;
        public LinkBean(final String link, final String label) {
            this.link = link;
            this.label = label;
        }
        public String getLabel() {
            return this.label;
        }
        public String getLink() {
            return this.link;
        }
        public void setLabel(final String label) {
            this.label = label;
        }
        public void setLink(final String link) {
            this.link = link;
        }


    }

    public FooPanel(final String id) {
        super(id);
        this.add(new ListView<LinkBean>("item", 
                Arrays.asList(
                    new LinkBean("http://www.google.com/","Google"), 
                    new LinkBean("http://www.ebay.com/", "Ebay"))
                ) {

            private static final long   serialVersionUID    = 1L;

            @Override
            protected void populateItem(final ListItem<LinkBean> item) {
                item.add(new ExternalLink("link", item.getModelObject().getLink())
                    .add(new Label("label",item.getModelObject().getLabel()))
                );

            }
        });
    }
}

And here is the associated HTML:

<html><head></head><body>
<wicket:panel>
    <div class="linkItem" wicket:id="item">
        <a href="" wicket:id="link" >
            <wicket:container wicket:id="label" />
        </a>
    </div>
</wicket:panel>
</body></html>

The Output will be something like this:

<div class="linkItem"><a href="http://www.google.com/"&gt;Google&lt;/a&gt;&lt;/div&gt;
<div class="linkItem"><a href="http://www.ebay.com/"&gt;Ebay&lt;/a&gt;&lt;/div&gt;

See

ListView and other repeaters (an ancient tutorial, careful: this relates to the older non-generic version of ListView in 1.3.x)
Wicket Examples: Repeater Views (ListView is not covered, but the handling is pretty identical)
ListView Api docs
Wicket in Action (A very good book about Wicket you should consider buying)

seanizer 2010-09-04 08:18:19

I need to add ExternalLink within ListView in the runtime. Your code is useful, but I still can't get the idea how to do that...

sonjafon 2010-09-07 00:11:18

OK, see my update

seanizer 2010-09-07 05:08:57

Thank you, very much. This code has solved my problems.

sonjafon 2010-09-08 00:30:37

then you should accept my answer...

seanizer 2010-09-08 04:24:27

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Wicket: How to add link address in runtime

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